The neo-cons keep using 9/11 as an excuse to be in Iraq.
Al-Queda (the version run by bin Laden) uses 9/11 as an excuse to try to convert the West to Islam.
Various factions in Iraq don't use 9/11 per se, but use the ensuing American-led power vacuum as an excuse to kill off "infidels" in the other factions.
There's currently a commercial by some neo-con support group in which a wounded American soldier blames 9/11 and terrorism on Iraq. It's such a lie that I want to throw something at the TV whenever I hear it. Yes, more Americans have now been killed in Iraq than by bin Laden's Al-Queda (though, a related group, Al-Queda in Iraq, have certainly killed many Iraqis, Americans and other folks in Iraq over the last four years). Yes, Hussein was a dictator, but we don't go out and topple all dictators. There are dictators in Saudi Arabia and other places who stay in power with American help.
It's disgusting what the neo-con-led American government continues to do.
9/11 is a sad day for America. But, frankly, our government's secondary response, to overthrow a generally uninvolved country, was a horrible thing to do. The American people, generally, have recovered from 9/11. But the Iraqi people may not.